There's a bunch of configuration items that specify how a support category (gunk, comms, entries, etc.) will behave. One of them specifies whether requests in that category are visible to all users, or only to those on a per-category list. (That's what determines whether the category gets a * next to its name on the http://www.dreamwidth.org/support/submit dropdown.) The bit of SQL I gave you is to mark all categories (table supportcat) as not public. bin/ljdb is a utility that sets up things so that you can enter SQL for your database by hand without having to paste your database credential from your hack config files into the shell command line.